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Patent Searching and Data


Title:
MULTISTAGE BOLT SOCKET
Document Type and Number:
WIPO Patent Application WO/2007/119883
Kind Code:
A1
Abstract:
The present invention relates to a multi-stage bolt socket integrating a plurality of sockets of different sizes capable of performing bolting work, thereby eliminating the need to replace sockets when connecting or disconnecting two or more bolts having different diameters. In order to improve upon drawbacks of the conventional multistage socket, i.e. drawbacks of sub-sockets being idle, and the inability of integrating three or more sockets, there is provided a multi-stage bolt socket wherein the smallest socket among sockets having different sizes is used as a main socket, and the relatively larger sockets are sequentially fitted on the main socket, the integrated sockets are constituted so as to easily rise and fall while maintaining a constant interval by the elastic force of a spring, and the sub-sockets are integrally constituted to rotate without idling with respect to the main socket, so that it is possible for more than three kinds of sub-sockets to be momentarily displaced.

Inventors:
KIM, Young Gu (MATSUOKA SEISAKUSHO SYATAKU, 6-18 Kashidanishi 2-Chome,Higashi Osaka-sh, OSAKA ., 577-0835, JP)
Application Number:
JP2007/058573
Publication Date:
October 25, 2007
Filing Date:
April 13, 2007
Export Citation:
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Assignee:
KIM, Young Gu (MATSUOKA SEISAKUSHO SYATAKU, 6-18 Kashidanishi 2-Chome,Higashi Osaka-sh, OSAKA ., 577-0835, JP)
International Classes:
B25B13/10; B25B13/02
Foreign References:
JPH0720259U
JPS6344775U
JPS584370U
JPH033781A
JPS61195971U
JPH01164070U
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Claims:

CLAIMS

1. A multi-stage bolt socket constituted of sockets having different diameters, which are sequentially fitted to be coupled in a multi-stage form, wherein the socket having the smallest diameter is used as a main socket (1) and all other sockets are used as sub-sockets, which rotate by receiving rotation power from the main socket (1), the multistage bolt socket is characterized in that: inner peripheral surfaces and outer peripheral surfaces of adjacent sockets are formed with a spring-receiving portion (8) for receiving one spring in the form of a groove at positions corresponding to each other, respectively; the inner peripheral surface of the socket located at an outer side is formed with an inner side sill (12) grooved from the lower end of the socket to a certain height, and the outer peripheral surface of the socket located at an inner side is formed with an outer side sill (11) projected from the lower end of the socket to a certain height; in an upper end of the spring-receiving portion (8), an outer stopping portion (9) is bonded to any one of the two adjacent sockets in order to allow the inner side socket to be slid, up and down, to the outer side socket within a certain range and bonded to the rest socket in order to support the spring, preventing the secession of the spring from the spring-receiving portion (8) but allowing it to be slid to the rest socket without interference; each of the sockets is constituted so that elastic restoration force is applied to the sockets located on their outer side and therefore, the upper end

positions of the sockets are uniform to each other in an initial state, but each of the sockets are constituted to be shorter and shorter in length by a certain interval proceeding inwardly and therefore, the lower end positions of the sockets become a raised form while proceeding inwardly.

Description:

DESCRIPTION

MULTISTAGE BOLT SOCKET

Technical Field

[0001] The present invention relates to a bolt and a nut connecting socket, and more specifically a multistage bolt socket capable of performing a bolting work with only one socket without the need for replacing sockets when connecting or disconnecting bolts having different diameters.

Background Art

[0002] In general, when bolts and nuts having different sizes are used in workplaces, such as construction sites assembling steel frames, an automobile assembly line, etc., workers must perform a bolting work while replacing sockets fitted to the diameters of the bolts and the nuts in order to connect or disconnect the bolts and the nuts, etc., so that there are the problems that the work time is long and the work efficiency is low.

[0003] Although a multistage bolt socket capable of performing the bolting work with only one socket without the need for replacing sockets has been proposed in the prior art in order to solve the problems, it cannot widely be used due to the problems described below.

[0004] FIG. 63 is a first embodiment of the conventional multistage bolt socket wherein a steel wire operated by an elastic body such as a spring is put

into an inner portion of a main socket (1) so that the steel wire serves as a sub- socket (20).

[0005] In other words, in the case where a diameter of a head portion of a bolt is smaller than the inner diameter of the main socket (1), the sub-socket (20) constituted by the steel wire fills a gap therebetween to support the head portion so that rotating power by an impact wrench can be transferred to the bolt through the main socket (1) and the sub-socket (20) as it is.

[0006] However, the embodiment of FIG. 63 has problems that since the sub-socket (20) is constituted by a plurality of thin steel wires, when the impact force by the impact wrench is repeatedly transferred to the sub-socket, the sub- socket is easily deformed and broken so that its durability is very low. [0007] Meanwhile, the embodiment of FIG. 63 can be applied without having particular problems when connecting the bolt of FIG. 64. However, when connecting a bolt (used for fixing a clamp, and bracket, etc. in a construction site) having screw portions lengthily extended left and right with putting the head portion of the bolt therebetween as shown in FIG. 65, since the sub-socket (20) pushed and raised by the screw portion entering even before the head portion of the bolt enters the inner portion of the main socket as shown in FIG. 72 contacts an upper wall of the socket to hinder the head portion of the bolt from being further entered, the embodiment of FIG. 63 can not be applied to the bolt of FIG 65.

[0008] FIG. 66 is a second embodiment of the conventional multistage bolt socket wherein the small diameter sub-socket (20) slides into the inner

portion of the large diameter main socket (1) while receiving the elastic force generated by the spring (7).

[0009] In such a conventional structure, there is an inherently fine gap between the main socket (1) and the sub-socket (20). Since the sub-socket (20) directly supporting the head portion of the bolt must be located at the inner portion of the main socket (1) so that in the case where the coupling angle of the socket to the bolt at the time of connection or disconnection by the impact wrench, etc. is only slightly deviated, the socket is pushed inwardly without supporting the bolt, if the impact wrench is used in this state, the rotating power is not transferred to the bolt so that the socket is idled. Thus, it is very difficult to constitute more than two kinds of the sub-sockets as a multistage form by such a structure.

[0010] FIG. 67 is a third embodiment of the conventional multistage bolt socket. It can be found in KR Patent Application No. 2004-15442.

[0011] Referring to FIG. 67, the third embodiment is identical with the embodiment of FIG 66 in that the large diameter socket is used as the main socket (1) and the small diameter socket is used as the sub-socket (20), however, it can solve the problem of the idling since the sub-socket (20) is projected from the tip of the main socket (1).

[0012] However, A portion is to locate a spring (7) on the outer peripheral surface and its length should be longer than that of the spring (7) so that a space (13) receiving an end portion of a bolt when connecting the bolt cannot sufficiently be assured. As a result, in the case where the end portion of

the bolt is extended by a significant length from the head portion thereof as in FIG. 65, it cannot sufficiently be received in the space (13). Therefore, there is a problem that the third embodiment cannot be applied to the bolt in such a form. Also, it is impossible to constitute more than two kinds of the sub-sockets as the multistage form due to the reverse function in the structure. [0013] FIG. 68 is a fourth embodiment of the conventional multistage bolt socket. It can be found in JP Utility model Application No. Heisei 7-20259 and Heisei 8-136. Referring to FIG. 68, the fourth embodiment is different from the conventional embodiments according to FIGs. 63, 66, and 67 in that the small diameter socket is used as the main socket (1) and the large diameter socket is used as the sub-socket (20).

[0014] In the fourth embodiment, the sub-socket (20) is elastically supported by the spring to be expanded and contracted in a longitudinal direction to the main socket (1). However, it has the problems as follows: first, the space receiving the spring (7) is not assured (in order to constitute the multistage bolt socket using the elastic body, it is necessary to assure the space receiving the elastic body and if not, the fourth embodiment cannot be applied to the bolt of FIG. 67, as in the embodiment of FIG. 67), and secondly, it is impossible to constitute more than two kinds of the sub-socket as the multistage form since there is a defect in the structure that a displacement apparatus (21) of the socket is located at the inner side of the sub-socket (20).

[0015] FIG. 69 is a fifth embodiment of the conventional multistage bolt socket. It can be found in JP Utility Model Application Showa 63-44775.

Likewise, in the fifth embodiment the small diameter socket is used as the main socket (1) and the large diameter socket is used as the sub-socket (20).

[0016] However, it has the problems that each of a second sub-socket (2) and a third sub-socket (3) is displaced by the socket displacing apparatus (21) in a ring type so that it takes much time to make the displacement operation and the displaced socket is temporally fixed by a rubber with elasticity so that it is inconvenient to detach the ring with both hands for every displacement. The structure similar to this can be found in JP Utility Model Application Heisei 7-

3014065.

[0017] FIG. 70 is a sixth embodiment of the conventional multistage bolt socket. It can be found in JP Patent Application No. 2003-245863. Herein, the sub-socket (20) is elastically expanded and contracted by the spring (7). It has the problems that the sub-socket is constituted by six socket pins so that it is easily worn due to large resisting force and the structure is complicated by forming the main socket (1) with a curve surface, etc. in order to receive the spring, so that it is impossible to constitute more than two kinds of the sub-sockets in the multistage form. The structure similar to this can be found in JP Patent

Application Heisei 8-257927.

[0018] FIG. 71 is a seventh embodiment of the conventional multistage bolt socket. It can be found in JP Patent Application No. Heisei 3-87571. Herein, the small diameter socket is used as the main socket (1) and the large diameter socket is used as the sub-socket (20).

[0019] However, it has a defect in the structure that an extra space is

formed in a spring receiving portion (8) so that the portion does not perform the role of receiving the spring and also, has inconvenience to use both hands in order to displace the sub-socket (20).

Disclosure

Technical Problem

[0020] The present invention has been proposed in order to solve the above problems.

[0021] It is a first object of the present invention to prevent the idling of the sub-socket during a connection of a bolt.

[0022] It is a second object of the present invention to improve the lack of durability.

[0023] It is a third object of the present invention to constituted more than two kinds of sub-sockets in a multistage form while momentarily displacing a sub-socket corresponding to an operating unit.

Technical Solution

[0024] In order to accomplish the above objects, there is provided a multistage bolt socket wherein the smallest socket among sockets having different sizes is used as a main socket and relatively large sockets are sequentially fitted on the main socket, the integrated sockets are constituted to be easily risen and fallen while mamtaining a constant interval by the elastic force

of a spring, and the sub-sockets are integrally constituted to be rotated without idling with respect to the main socket, so that it is possible for more than three kinds of the sub-sockets to be momentarily displaced.

Advantageous effect

[0025] The present invention uses the small socket as the main socket and the large socket as the sub-socket to prevent the idling. Also, the present invention can perform the bolting works without the need for replacing the sockets when connecting and disconnecting more than two bolts and nuts having different diameters, making it possible to shorten the work time. [0026] In other words, in order to improve the disadvantage that the sub-socket is idled when using the sub-socket and the disadvantage that more than three sockets cannot be integrated, the smallest socket among sockets having different sizes is used as a main socket and relatively large sockets are sequentially fitted on the main socket, the integrated sockets are constituted to be easily risen and fallen while maintaining a constant interval by the elastic force of a spring, and the sub-sockets are integrally constituted to be rotated without idling with respect to the main socket, so that it is possible for more than three kinds of the sub-sockets to be momentarily displaced.

[0027] Also, even when the socket is slightly slantly fitted into the bolt by the mistake of a user, the socket completely supports the bolt by the elastic force of the spring so that the idling of the bolt does not occur in any situation. [0028] And, it has advantage that the multistage bolt socket is simple in

the structure so that the failure does not almost occur and can be operated with one hand so that it is convenient to use.

Description of Drawings

[0029] FIG. 1 is a transversely cross-sectional view showing an example of use of a multistage bolt socket according to the present invention wherein five sockets having different diameters is integrally coupled;

[0030] FIG. 2 is a front view of the multistage bolt socket according to the present invention;

[0031] FIG. 3 is a left side view of the multistage bolt socket according to the present invention wherein five sockets having different diameters are integrally coupled;

[0032] FIG. 4 is a left side view of the multistage bolt socket according to the present invention wherein four sockets having different diameters are integrally coupled;

[0033] FIG. 5 is a left side view of the multistage bolt socket according to the present invention wherein three sockets having different diameters are integrally coupled;

[0034] FIG. 6 is a left side view of the multistage bolt socket according to the present invention wherein two sockets having different diameters are integrally coupled;

[0035] FIG. 7 is a cross-sectional view taken along the A-B line of FIG. 2 wherein five sockets having different diameters are integrally coupled;

[0036] FIG. 8 is a cross-sectional view taken along the A-B line of FIG. 2 wherein four sockets having different diameters are integrally coupled;

[0037] FIG. 9 is a cross-sectional view taken along the A-B line of FIG. 2 wherein three sockets having different diameters are integrally coupled;

[0038] FIG. 10 is a cross-sectional view taken along the A-B line of FIG.

2 wherein two sockets having different diameters are integrally coupled;

[0039] FIG. 11 is a cross-sectional view taken along the C-D line of FIG.

3;

[0040] FIG. 12 is a cross-sectional view taken along the A-B line of FIG.

3;

[0041] FIG. 13 is a cross-sectional view showing an example of use of the multistage bolt socket of FIG. 11;

[0042] FIG. 14 is a cross-sectional view taken along the A-B line of FIG.

6;

[0043] FIG. 15 is a cross-sectional view showing an example of use of the multistage bolt socket of FIG. 14;

[0044] FIG. 16 is a cross-sectional view showing an example of use of the multistage bolt socket of FIG. 14 wherein the used state of the main socket is shown;

[0045] FIG. 17 is a front view separately showing only the main socket used in the present invention;

[0046] FIG. 18 is a left side view separately showing only the main socket used in the present invention;

[0047] FIG. 19 is a right side view separately showing only the main socket used in the present invention;

[0048] FIG. 20 is a cross-sectional view taken along the A-B line of FIG.

17;

[0049] FIG. 21 is a front view separately showing only the middle sub- socket used in the present invention;

[0050] FIG. 22 is a left side view separately showing only the middle sub-socket used in the present invention;

[0051] FIG. 23 is a right side view separately showing only the middle sub-socket used in the present invention;

[0052] FIG. 24 is a cross-sectional view taken along the A-B line of FIG.

23;

[0053] FIG. 25 is a cross-sectional view taken along the C-D line of FIG.

23;

[0054] FIG. 26 is a front view separately showing only the outermost sub-socket used in the present invention;

[0055] FIG. 27 is a cross-sectional view taken along the A-B line of FIG.

26;

[0056] FIG. 28 is a right side view separately showing only the outermost sub-socket used in the present invention;

[0057] FIG. 29 is a left side view separately showing only the outermost sub-socket used in the present invention; [0058] FIG. 30 is a plan view separately showing only the spring

stopping portion coupled to the upper portion of the main socket;

[0059] FIG. 31 is a plan view separately showing only the spring stopping portion coupled to the upper portion of the sub-socket;

[0060] FIG. 32 is an exploded perspective view showing the state where a second sub-socket is coupled to the main socket;

[0061] FIG. 33 is an exploded perspective view showing the state where a third sub-socket is coupled to the main socket to which the second sub-socket is coupled;

[0062] FIG. 34 is an exploded perspective view showing the state where a fourth sub-socket is coupled to the main socket to which the second and third sub-sockets are coupled;

[0063] FIG. 35 is an exploded perspective view showing the state where a fifth sub-socket is coupled is coupled to the main socket to which the second, third and fourth sub-sockets are coupled.

[0064] FIG. 36 is a front view showing a multistage bolt stage constituted by a 12 angle socket for a ratchet handle according to a second embodiment of the present invention;

[0065] FIG. 37 is a left side view showing a multistage bolt stage constituted by a 12 angle socket for a ratchet handle according to the second embodiment of the present invention;

[0066] FIG. 38 is a right side view showing a multistage bolt stage constituted by a 12 angle socket for a ratchet handle according to a second embodiment of the present invention;

[0067] FIG. 39 is a cross-sectional view taken along A-B of FIG. 38;

[0068] FIG. 40 is a cross-sectional view taken along A-B of FIG. 38;

[0069] FIG. 41 is a front view separately showing only a main socket used in the second embodiment of the present invention;

[0070] FIG. 42 is a right side view separately showing only the main socket used in the second embodiment of the present invention;

[0071] FIG. 43 is a right side view separately showing only the main socket used in the second embodiment of the present invention;

[0072] FIG. 44 is a cross-sectional view taken along A-B of FIG. 41;

[0073] FIG. 45 is a cross-sectional view taken along C-D of FIG. 41;

[0074] FIG. 46 is a front view separately showing only a spring supporting portion used in the second embodiment of the present invention;

[0075] FIG. 47 is a left side view and a right side view separately showing only the spring supporting portion used in the second embodiment of the present invention;

[0076] FIG. 48 is a front view separately showing only a second socket used in the second embodiment of the present invention;

[0077] FIG. 49 is a right side view separately showing only the second socket used in the second embodiment of the present invention;

[0078] FIG. 50 is a left side view separately showing only the second socket used in the second embodiment of the present invention;

[0079] FIG. 51 is a cross-sectional view taken along of FIG. 50;

[0080] FIG. 52 is a cross-sectional view taken along of FIG. 50;

[0081] FIG. 53 is a front view separately showing only a third socket used in the second embodiment of the present invention;

[0082] FIG. 54 is a left side view separately showing only the third socket used in the second embodiment of the present invention;

[0083] FIG. 55 is a right side view separately showing only the third socket used in the second embodiment of the present invention;

[0084] FIG. 56 is a cross-sectional view taken along of FIG. 53;

[0085] FIG. 57 is an exploded view showing the state where the second sub-socket is coupled to the main socket;

[0086] FIG. 58 is an exploded view showing the state where the third sub-socket is coupled to the main socket to which the second sub-socket is coupled;

[0087] FIG. 59 is a cross-sectional view taken along of FIG. 56;

[0088] FIG. 60 is a cross-sectional view taken along of FIG. 51

[0089] FIG. 61 is a cross-sectional view showing an example of use of the multistage bolt socket of FIG. 36 wherein the used state of the main socket is shown;

[0090] FIG. 62 is a cross-sectional view showing an example of use of the multistage bolt socket of FIG. 14 wherein the used state of the third socket is shown;

[0091] FIG. 63 is a perspective view showing a first embodiment of the conventional multistage bolt socket;

[0092] FIG. 64 is a front view showing one example of the bolt structure;

[0093] FIG. 65 is a front view showing another example of the bolt structure;

[0094] FIG. 66 is a transversely cross-sectional view showing a second embodiment of the conventional multistage bolt socket;

[0095] FIG. 67 is a transversely cross-sectional view showing a third embodiment of the conventional multistage bolt socket;

[0096] FIG. 68 is a transversely cross-sectional view showing a fourth embodiment of the conventional multistage bolt socket;

[0097] FIG. 69 is a transversely cross-sectional view showing a fifth embodiment of the conventional multistage bolt socket;

[0098] FIG. 70 is a transversely cross-sectional view showing a sixth embodiment of the conventional multistage bolt socket;

[0099] FIG. 71 is a transversely cross-sectional view showing a seventh embodiment of the conventional multistage bolt socket; and

[00100] FIG. 72 is a used state view of the first embodiment of the conventional multistage bolt socket.

Description for Key Elements in the Drawing

1: Main socket 2: Second sub-socket

3: Third sub-socket 4: Fourth sub-socket

5: Fifth sub-socket 6: Mounting portion

7: Spring 8: Spring receiving portion

: Outer side stopping portion 10: Inner side stopping portion

11 : Outer side sill 12: Inner side sill

13: Space 14: Square aperture

15: Socket 16: Impact wrench

17: Impact drive 18: Bolt

19: Aperture 20: Sub-socket

21: Socket displacing apparatus

Best Mode

[00101] FIG. 1 to FIG. 36 are views showing a first embodiment of the present invention and FIG. 37 to FIG. 62 are views showing a second embodiment of the present invention.

[00102] Hereinafter, the first embodiment of the present invention will be described. Herein, sockets (1), (2), (3), (4), and (5) having different diameters are sequentially fitted so that they are coupled in a multistage form, wherein the smallest diameter socket is used as a main socket (1) and all the rest are transferred with rotating force from the main socket (1) so that they serve as the rotating sub-sockets (2), (3), (4) and (5).

[00103] The detailed construction of each socket will be described.

[00104] FIG. 24 to FIG. 27 are views showing the large diameter sockets located at the outermost. The socket is generally a pipe shape of which the front and rear are opened, wherein the outer wall of the left side end downwardly

directed during use is formed with a short step more projected than the rest portion thereof, that is, the sill (11) of the outer side and the inner wall of the left side end is formed with a short step more grooved than the rest portion thereof, that is, the sill (12) of the inner side.

[00105] Also, the inner wall of the right side end upwardly directed during use is formed with a spring receiving portion (8) for receiving a spring (7), wherein each of the lower end and the upper end is formed with an inner side stopping portion 10 and an outer side stopping portion (9) (see FIG. 31) for supporting both ends of the spring.

[00106] FIG. 21 to FIG. 23 are views a socket located at the middle, wherein the socket is fitted and coupled to the inner portion of the large diameter socket from downward.

[00107] As in the large diameter socket (see FIG. 21), the socket is generally a pipe shape of which the front and rear are opened, wherein the outer wall of the left side end downwardly directed during use is formed with a short step more projected than the rest portion thereof, that is, the sill (11) of the outer side and the inner wall of the left side end is formed with a short step more grooved than the rest portion thereof, that is, the sill (12) of the inner side. [00108] Also, each of the outer wall and the inner wall of the right side end upwardly directed during use is formed with the spring receiving portion (8) for receiving the spring (7), wherein each of the lower end and the upper end is formed with the inner side stopping portion 10 and the outer side stopping portion (9) (see FIG. 31) for supporting both ends of the spring.

[00109] When coupling the middle diameter socket to the large diameter socket, it is made by first entering the upper portion of the middle diameter socket through an opening portion on the lower side of the large diameter socket. At this time, the spring (7) is received in the spring receiving portion (8) so that the spring receiving portion (8) of the middle diameter socket conforms to the spring receiving portion (8) of the large diameter socket.

[00110] The lower end of the spring (7) is supported by the inner side stopping portions of the middle diameter socket and the large diameter socket. In the examples shown, the sockets are coupled to each other, with fitting the spring (7) to the spring receiving portion (8) and the upper ends of the sockets are then bonded to the outer side stopping portion (9) so that the secession of the spring can be prevented during use.

[00111] At this time, the outer side stopping portion (9) is bonded to any one of two adjacent sockets and takes a plate shape formed by the combination of the half as a small diameter circle and the rest half as a large diameter circle, as in FGI. 31, wherein the small diameter circle is formed to be smaller than the groove of the spring receiving portion (8) for the middle socket and the large diameter circle is formed to be larger than the groove of the spring receiving portion (8) for the middle socket, and only a portion of the large diameter circle is bonded to the large diameter socket and a portion of the small diameter circle can constituted to be slid up and down through the groove of the spring receiving portion. [00112] In the state where the large diameter socket and the middle

diameter socket are assembled, the middle diameter socket can be constituted to be slid to the large diameter socket up and down and to be returned to an original location by the elasticity of the spring received in the spring receiving portion (8). [00113] Upon sliding, it slides until the interference between the inner side sill (12) formed in the inner wall of the large diameter socket and the outer side sill (11) formed in the outer wall of the middle diameter socket occurs so that it moves only within a limited range.

[00114] On the other hand, FIGs. 17 to 20 are views showing the main socket located at the innermost, wherein the main socket is fitted and coupled to the inner portion of the middle diameter socket coupled to the large diameter socket from downward.

[00115] As in the large diameter socket, the socket is generally a pipe shape of which the front and rear are opened, wherein the outer wall of the left side end downwardly directed during use is formed with a short step more projected than the rest portion thereof, that is, the sill (11) of the outer side. [00116] Also, the outer wall of the right side end upwardly directed during use is formed with the spring receiving portion (8) for receiving the spring (7), wherein each of the lower end and the upper end is formed with an inner side stopping portion 10 and an outer side stopping portion (9) (see FIG. 30) for supporting both ends of the spring.

[00117] When coupling the main socket to the middle diameter socket coupled to the large diameter socket, it is made by first entering the upper portion of the main socket through an opening portion on the lower side of the middle

diameter socket. At this time, the spring (7) is received in the spring receiving portion (8) so that the spring receiving portion (8) of the main socket conforms to the spring receiving portion (8) of the middle diameter socket.

[00118] The lower end of the spring (7) is supported by the inner side stopping portions of the main socket and the middle diameter socket and the upper end of the spring (7) is supported by the outer stopping portion (9). In the examples shown, the sockets are coupled to each other, with fitting the spring (7) to the spring receiving portion (8) and the upper ends of the sockets are then bonded to the outer side stopping portion (9) so that the secession of the spring can be prevented during use.

[00119] At this time, the outer side stopping portion (9) is bonded to any one of two adjacent sockets and takes a plate shape in which each of two small diameter circles is integrally formed on the left and right sides of the large diameter circle as in FIG. 30, wherein the large diameter circle is bonded to the upper surface of the main socket, it being bonded so that the small diameter circle is at the location of the groove of the spring receiving portion (8) formed in the inner wall of the middle socket.

[00120] On the other hand, since the small diameter circle is formed to be smaller than the groove of the spring receiving portion (8), only a portion of the large diameter circle is bonded to the main socket and a portion of the small diameter circle can constituted to be slid up and down through the groove of the spring receiving portion.

[00121] In the state where the large diameter socket and the middle

diameter socket are assembled, the main socket can constitute to be slid to the large diameter socket up and down and the middle diameter socket can constitute to be slid to the large diameter socket up and down, wherein each of the main socket and the middle diameter socket can constitute to be returned to an original location by the elasticity of the spring received in the spring receiving portion (8). [00122] Upon sliding, they slide until the interference between the inner side sill (12) formed in the inner wall of the middle diameter socket and the outer side sill (11) formed in the outer wall of the main socket occurs so that they moves only within a limited range.

[00123] FIGs. 7 to 10 are a cross-sectional view of a multistage bolt socket according to the present invention wherein several sockets having different diameters is sequentially assembled to maintain equal intervals and a groove is formed on the inner wall and the outer wall of two adjacent sockets to form a spring receiving portion (8).

[00124] Meanwhile, in the examples shown, the two spring receiving portions 8 is formed to be symmetrical to each other in the same stage and deviated from each other by 90° in the next stage. However, a range of the present invention is not limited to this and the number and the position of the spring receiving portion (8) can be modified.

[00125] FIG. 1 is a cross-sectional view showing a initial state of the multistage bolt socket according to the present invention wherein since each of the sockets is constituted so that elastic restoration force is applied to the sockets located at the their outer side, the upper end positions of the sockets are uniform

to each other in the initial state. However, each of the sockets is constituted to be shorter and shorter in the lengths by a certain interval as proceeding inwardly so that the lower end positions of the sockets become a raised form as proceeding inwardly.

[00126] Therefore, when the multistage bolt socket is used for the bolt having a large diameter and fitted to the outermost socket, it can be used while maintaining the shape of the initial state as it is as in FIG. 1. [00127] However, when the multistage bolt socket is used for the bolt having a smaller diameter as in FIGs. 13 or 16, the mounting portion 6 must be pushed until the socket fitted to the diameter of the bolt (18) arrives at the position of the bolt (18). At this time, the sockets located at the inner side of the multistage socket are slid to the sockets located at the outer side of them wherein the inner side sockets is slid only until the sills (11) and (12) formed in the outer peripheral surface and the inner peripheral surface of the sockets interfere with each other. Therefore, when the multistage bolt socket is used for a small bolt as in the example shown, the lower end positions of the sockets are uniform to each other, however, the upper end positions of the sockets become a raised form such as a stop shape as proceeding from inner side to outer side. [00128] As such, in the present invention, the smallest socket becomes the main socket so that there is no possibility of the idling, and the spring receiving portion (8) is also located between the two adjacent sockets and the groove is formed on the adjacent wall surface so that the restoration force of the spring (7) is properly actuated as well as the structure is simple.

[00129] Moreover, in the present invention, even when using the socket slightly slantly fitted into the bolt by the mistake of user, the elastic force of the spring is excellently actuated, and each of the sockets is closely assembled in equal intervals so that the socket will properly support the bolt and there is no risk of the idling.

[00130] And, the multistage bolt socket according to the present invention has advantages that the multistage bolt socket is simple in the structure so that the possibility of failure is reduced and can be operated with one hand so that it is convenient to use.

[00131] FIGs. 37 to 62 are views showing a second embodiment of the present invention almost similar to the first embodiment except that a twelve- angle socket is used instead of the hexagonal socket. Accordingly, concrete description of FIGs. 37 to 62 is omitted.

[00132] Concretely showing the second embodiment using separate drawings is to represent the fact that the present invention includes the hexagonal socket as well as twelve-angle socket so that it is also applicable to things (refer to FIGs. 11, 12, 14, and 15) having a fixed mounting portion and things (refer to FIGs. 39, 40, 61, and 62) having a unfixed mounting portion, etc.

Industrial Applicability

[00133] The present invention can perform a bolting work with only one socket without the need for replacing sockets when connecting and disconnecting

a bolt in workplaces such as an automobile assembly line, etc. by enabling a socket for bolts having different diameters to be momentarily displaced, so that the work efficiency can be further improved.